用Set类判断Map里key是否存在的示例代码

public boolean checksgdlookpre(string sgdbrid, ce_sysuser cuser) {
  if (cuser.getsu_roleid() == 6) {
   return true;
  }
  string[] strarray = cuser.getuserviewbranchs().split(",");
  set<string> strset = new hashset<string>();
  collectionutils.addall(strset, strarray);
  return strset.contains(sgdbrid);
 }